linux-kernel - Re: [PATCH v7 2/5] ARM: add AFTR mode support to firmware do

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Date:	Thu, 25 Sep 2014 17:23:32 +0900
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
CC:	Kukjin Kim <kgene.kim@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-pm@...r.kernel.org,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Tomasz Figa <tomasz.figa@...il.com>,
	linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Thierry Reding <thierry.reding@...il.com>,
	linux-tegra@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org,
	Thierry Reding <treding@...dia.com>
Subject: Re: [PATCH v7 2/5] ARM: add AFTR mode support to firmware do_idle
 method

On 09/24/14 21:24, Bartlomiej Zolnierkiewicz wrote:
> On some platforms (i.e. EXYNOS ones) more than one idle mode is
> available and we need to distinguish them in firmware do_idle method.
>
> Add mode parameter to do_idle firmware method and AFTR mode support
> to EXYNOS do_idle implementation.
>
> This change is a preparation for adding secure firmware support to
> EXYNOS cpuidle driver.
>
> This patch shouldn't cause any functionality changes.
>
> Signed-off-by: Bartlomiej Zolnierkiewicz<b.zolnierkie@...sung.com>
> Acked-by: Kyungmin Park<kyungmin.park@...sung.com>
> ---
> v7:
> - fixed build on Tegra
> - updated summary line
>
>   arch/arm/include/asm/firmware.h        |  2 +-
>   arch/arm/mach-exynos/common.h          |  5 +++++
>   arch/arm/mach-exynos/firmware.c        | 10 ++++++++--
>   arch/arm/mach-tegra/cpuidle-tegra114.c |  2 +-
>   4 files changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm/include/asm/firmware.h b/arch/arm/include/asm/firmware.h
> index 5904f59..89aefe1 100644
> --- a/arch/arm/include/asm/firmware.h
> +++ b/arch/arm/include/asm/firmware.h
> @@ -28,7 +28,7 @@ struct firmware_ops {
>   	/*
>   	 * Enters CPU idle mode
>   	 */
> -	int (*do_idle)(void);
> +	int (*do_idle)(unsigned long mode);
>   	/*
>   	 * Sets boot address of specified physical CPU
>   	 */
> diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
> index c218200..2d830df 100644
> --- a/arch/arm/mach-exynos/common.h
> +++ b/arch/arm/mach-exynos/common.h
> @@ -119,6 +119,11 @@ extern void __iomem *sysram_base_addr;
>   extern void __iomem *pmu_base_addr;
>   void exynos_sysram_init(void);
>
> +enum {
> +	FW_DO_IDLE_SLEEP,
> +	FW_DO_IDLE_AFTR,
> +};
> +
>   void exynos_firmware_init(void);
>
>   extern u32 exynos_get_eint_wake_mask(void);
> diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
> index f5e626d..e57b7c3 100644
> --- a/arch/arm/mach-exynos/firmware.c
> +++ b/arch/arm/mach-exynos/firmware.c
> @@ -28,9 +28,15 @@
>   #define EXYNOS_BOOT_ADDR	0x8
>   #define EXYNOS_BOOT_FLAG	0xc
>
> -static int exynos_do_idle(void)
> +static int exynos_do_idle(unsigned long mode)
>   {
> -	exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
> +	switch (mode) {
> +	case FW_DO_IDLE_AFTR:
> +		exynos_smc(SMC_CMD_CPU0AFTR, 0, 0, 0);
> +		break;
> +	case FW_DO_IDLE_SLEEP:
> +		exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
> +	}
>   	return 0;
>   }
>
> diff --git a/arch/arm/mach-tegra/cpuidle-tegra114.c b/arch/arm/mach-tegra/cpuidle-tegra114.c
> index e3ebdce..425b6c8 100644
> --- a/arch/arm/mach-tegra/cpuidle-tegra114.c
> +++ b/arch/arm/mach-tegra/cpuidle-tegra114.c
> @@ -49,7 +49,7 @@ static int tegra114_idle_power_down(struct cpuidle_device *dev,
>   	call_firmware_op(prepare_idle);
>
>   	/* Do suspend by ourselves if the firmware does not implement it */
> -	if (call_firmware_op(do_idle) == -ENOSYS)
> +	if (call_firmware_op(do_idle, 0) == -ENOSYS)
>   		cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
>
>   	clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT,&dev->cpu);

+ Thierry(using nvidia.com e-mail address)

Hi Thierry,

For supporting AFTR mode in call_firmware_op(do_idle), need to modify 
tegra stuff as you can see. The functionality will be same with before. 
Is it OK to you? If you have no objection, I'd like to take this series 
into samsung tree.

Thanks,
Kukjin




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